Update the release process doc (#5419)

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Maxime Guyot 2019-12-10 13:41:29 +01:00 committed by Kubernetes Prow Robot
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The Kubespray Project is released on an as-needed basis. The process is as follows:
1. An issue is proposing a new release with a changelog since the last release
2. At least one of the [OWNERS](OWNERS) must LGTM this release
3. An OWNER runs `git tag -s $VERSION` and inserts the changelog and pushes the tag with `git push $VERSION`
4. The release issue is closed
5. An announcement email is sent to `kubernetes-dev@googlegroups.com` with the subject `[ANNOUNCE] Kubespray $VERSION is released`
2. At least one of the [approvers](OWNERS_ALIASES) must approve this release
3. An approver creates [new release in GitHub](https://github.com/kubernetes-sigs/kubespray/releases/new) using a version and tag name like `vX.Y.Z` and attaching the release notes
4. An approver creates a release branch in the form `release-vX.Y`
5. The corresponding version of [quay.io/kubespray/kubespray:vX.Y.Z](https://quay.io/repository/kubespray/kubespray) docker image is built and tagged
6. The `KUBESPRAY_VERSION` variable is updated in `.gitlab-ci.yml`
7. The release issue is closed
8. An announcement email is sent to `kubernetes-dev@googlegroups.com` with the subject `[ANNOUNCE] Kubespray $VERSION is released`
## Major/minor releases, merge freezes and milestones
* Kubespray does not maintain stable branches for releases. Releases are tags, not
branches, and there are no backports. Therefore, there is no need for merge
freezes as well.
* Kubespray maintains one branch for major releases (vX.Y). Minor releases are available only as tags.
* Security patches and bugs might be backported.
* Fixes for major releases (vX.x.0) and minor releases (vX.Y.x) are delivered
via maintenance releases (vX.Y.Z) and assigned to the corresponding open